baseui/utils/deep-merge.js

A React Component library implementing the Base design language

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = deepMerge;
/*
Copyright (c) Uber Technologies, Inc.

This source code is licensed under the MIT license found in the
LICENSE file in the root directory of this source tree.
*/

function deepMerge(target, ...sources) {
  target = target || {};
  const len = sources.length;
  let obj;
  let value;
  for (let i = 0; i < len; i++) {
    obj = sources[i] || {};
    for (let key in obj) {
      // @ts-ignore
      if (typeof obj[key] !== undefined) {
        // @ts-ignore
        value = obj[key];
        if (isCloneable(value)) {
          // @ts-ignore
          target[key] = deepMerge( /* eslint-disable-next-line no-mixed-operators */
          // @ts-ignore
          target[key] || Array.isArray(value) && [] || {}, value);
        } else {
          // @ts-ignore
          target[key] = value;
        }
      }
    }
  }
  return target;
}
function isCloneable(obj) {
  /* eslint-disable-next-line eqeqeq */
  return Array.isArray(obj) || {}.toString.call(obj) == '[object Object]';
}